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Acetic acid hydroconversion to ethanol over supported nickel and indium-modified nickel catalysts

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Abstract

Volatile carboxylic acids (mainly acetic acid) can be produced efficiently by simple thermochemical or biological degradation of various biomasses. For the processing of such oxygenates in hydrogen atmosphere, acetic acid (AA) hydroconversion was studied in detail over zeolite-based Ni and bimetallic InNi catalysts in a flow-through reactor at 21 bar total pressure and 240–380 °C. Efficient hydrogenating contacts were already obtained by in situ reduction of Ni-zeolites (A, X, P) and mainly co-reduction of their mixtures with In2O3 in H2 flow at 21 bar and 450 °C. Under these conditions, the bulk of charge-compensating nickel cations remained unreduced and therefore a large portion of the microporous zeolite structure was still preserved. Modification of the formed Ni particles with indium quest metal generated bimetallic NiIn/Ni,H-zeolite catalysts having higher hydroconversion activity with much lowered hydrodecarbonylation and with enhanced ethanol selectivity than the parent partially destructed Ni/Ni,H-zeolite. The activity dependence on the reactant partial pressure denotes rate-controlling surface reaction according to the Langmuir–Hinshelwood mechanism.

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Acknowledgments

The authors wish to express their appreciation to Mrs. Ágnes Farkas Wellisch for her technical assistance. Thanks is due to the Hungary-Slovakia Cross-border Co-operation Programme (Project registration number: HUSK/1101/1.2.1/0318) for supporting this research. Thanks to the European Union and the State of Hungary co-financed by the European Social Fund in the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 ‘National Excellence Program’ for the further support.

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Authors and Affiliations

  1. Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary

    György Onyestyák, Szabolcs Harnos, Szilvia Klébert & Dénes Kalló

  2. Department of Organic Technology, Slovak University of Technology, Bratislava, 81237, Slovak Republic

    Magdalena Štolcová & Alexander Kaszonyi

Authors
  1. György Onyestyák
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  2. Szabolcs Harnos
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  3. Szilvia Klébert
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  4. Magdalena Štolcová
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  5. Alexander Kaszonyi
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  6. Dénes Kalló
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Correspondence to György Onyestyák.

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Onyestyák, G., Harnos, S., Klébert, S. et al. Acetic acid hydroconversion to ethanol over supported nickel and indium-modified nickel catalysts. Res Chem Intermed 41, 9181–9193 (2015). https://doi.org/10.1007/s11164-015-1945-1

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  • DOI: https://doi.org/10.1007/s11164-015-1945-1

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